LOCKSTATE LS-90 Operation Guide User Manual

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3. Select the number of stages of compression for your cooling system (1 or 2) by touching the
number of STAGES and using +/- buttons to change.
NOTE: If your system does not have A/C select NONE as your number of stages and you won’t be
bothered with on-screen cooling messages
4. Touch to select the appropriate FAN CONTROL setting HVAC or TSTAT.
NOTE: Most cooling systems require that the thermostat TSTAT control the fan.
5. Press HOME to return to the Home screen.

SET-UP for HEAT PUMP systems (up to 3 Stages)

1. Press MENU and then touch HVAC SET-UP.
2. Touch HEAT in the upper left corner of the display.
3. Touch HEAT PUMP.
4. Select the number of stages of compression for your heat pump system (1 or 2) by touching the
number of STAGES, and using the +/- buttons to increase or decrease.
NOTE: Most heat pump systems have one stage of compression.

5. If you have AUXILIARY heat, touch the number of AUX stages (default is [NONE] ) use the +/-

buttons to select the number of AUX stages (1-2 stages) in your system.

6. (If you have AUX) Select the type of auxiliary heat that you have - Electric or Gas-Oil.
NOTE: Most heat pump systems have electric heat strips for auxiliary heat.
7. Fan Control is by the

LS-90 (tstat) for heat pumps.

8. Press HOME button to return to the Home screen. NOTE: For heat pump system your cooling is

already configured, the heat pump unit provides both heating and cooling.